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Influence of Vanadium Micro-Alloying on the Microstructure of Structural High Strength Steels Welded Joints

The inter-critically reheated grain coarsened heat affected zone (IC GC HAZ) has been reported as one of the most brittle section of high-strength low-alloy (HSLA) steels welds. The presence of micro-alloying elements in HSLA steels induces the formation of microstructural constituents, capable to i...

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Autores principales: Stornelli, Giulia, Tselikova, Anastasiya, Mirabile Gattia, Daniele, Mortello, Michelangelo, Schmidt, Rolf, Sgambetterra, Mirko, Testani, Claudio, Zucca, Guido, Di Schino, Andrea
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10096130/
https://www.ncbi.nlm.nih.gov/pubmed/37049191
http://dx.doi.org/10.3390/ma16072897
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author Stornelli, Giulia
Tselikova, Anastasiya
Mirabile Gattia, Daniele
Mortello, Michelangelo
Schmidt, Rolf
Sgambetterra, Mirko
Testani, Claudio
Zucca, Guido
Di Schino, Andrea
author_facet Stornelli, Giulia
Tselikova, Anastasiya
Mirabile Gattia, Daniele
Mortello, Michelangelo
Schmidt, Rolf
Sgambetterra, Mirko
Testani, Claudio
Zucca, Guido
Di Schino, Andrea
author_sort Stornelli, Giulia
collection PubMed
description The inter-critically reheated grain coarsened heat affected zone (IC GC HAZ) has been reported as one of the most brittle section of high-strength low-alloy (HSLA) steels welds. The presence of micro-alloying elements in HSLA steels induces the formation of microstructural constituents, capable to improve the mechanical performance of welded joints. Following double welding thermal cycle, with second peak temperature in the range between Ac1 and Ac3, the IC GC HAZ undergoes a strong loss of toughness and fatigue resistance, mainly caused by the formation of residual austenite (RA). The present study aims to investigate the behavior of IC GC HAZ of a S355 steel grade, with the addition of different vanadium contents. The influence of vanadium micro-alloying on the microstructural variation, RA fraction formation and precipitation state of samples subjected to thermal cycles experienced during double-pass welding was reported. Double-pass welding thermal cycles were reproduced by heat treatment using a dilatometer at five different maximum temperatures of the secondary peak in the inter-critical area, from 720 °C to 790 °C. Although after the heat treatment it appears that the addition of V favors the formation of residual austenite, the amount of residual austenite formed is not significant for inducing detrimental effects (from the EBSD analysis the values are always less than 0.6%). Moreover, the precipitation state for the variant with 0.1 wt.% of V (high content) showed the presence of vanadium rich precipitates with size smaller than 60 nm of which, more than 50% are smaller than 15 nm.
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spelling pubmed-100961302023-04-13 Influence of Vanadium Micro-Alloying on the Microstructure of Structural High Strength Steels Welded Joints Stornelli, Giulia Tselikova, Anastasiya Mirabile Gattia, Daniele Mortello, Michelangelo Schmidt, Rolf Sgambetterra, Mirko Testani, Claudio Zucca, Guido Di Schino, Andrea Materials (Basel) Article The inter-critically reheated grain coarsened heat affected zone (IC GC HAZ) has been reported as one of the most brittle section of high-strength low-alloy (HSLA) steels welds. The presence of micro-alloying elements in HSLA steels induces the formation of microstructural constituents, capable to improve the mechanical performance of welded joints. Following double welding thermal cycle, with second peak temperature in the range between Ac1 and Ac3, the IC GC HAZ undergoes a strong loss of toughness and fatigue resistance, mainly caused by the formation of residual austenite (RA). The present study aims to investigate the behavior of IC GC HAZ of a S355 steel grade, with the addition of different vanadium contents. The influence of vanadium micro-alloying on the microstructural variation, RA fraction formation and precipitation state of samples subjected to thermal cycles experienced during double-pass welding was reported. Double-pass welding thermal cycles were reproduced by heat treatment using a dilatometer at five different maximum temperatures of the secondary peak in the inter-critical area, from 720 °C to 790 °C. Although after the heat treatment it appears that the addition of V favors the formation of residual austenite, the amount of residual austenite formed is not significant for inducing detrimental effects (from the EBSD analysis the values are always less than 0.6%). Moreover, the precipitation state for the variant with 0.1 wt.% of V (high content) showed the presence of vanadium rich precipitates with size smaller than 60 nm of which, more than 50% are smaller than 15 nm. MDPI 2023-04-05 /pmc/articles/PMC10096130/ /pubmed/37049191 http://dx.doi.org/10.3390/ma16072897 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Stornelli, Giulia
Tselikova, Anastasiya
Mirabile Gattia, Daniele
Mortello, Michelangelo
Schmidt, Rolf
Sgambetterra, Mirko
Testani, Claudio
Zucca, Guido
Di Schino, Andrea
Influence of Vanadium Micro-Alloying on the Microstructure of Structural High Strength Steels Welded Joints
title Influence of Vanadium Micro-Alloying on the Microstructure of Structural High Strength Steels Welded Joints
title_full Influence of Vanadium Micro-Alloying on the Microstructure of Structural High Strength Steels Welded Joints
title_fullStr Influence of Vanadium Micro-Alloying on the Microstructure of Structural High Strength Steels Welded Joints
title_full_unstemmed Influence of Vanadium Micro-Alloying on the Microstructure of Structural High Strength Steels Welded Joints
title_short Influence of Vanadium Micro-Alloying on the Microstructure of Structural High Strength Steels Welded Joints
title_sort influence of vanadium micro-alloying on the microstructure of structural high strength steels welded joints
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10096130/
https://www.ncbi.nlm.nih.gov/pubmed/37049191
http://dx.doi.org/10.3390/ma16072897
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